Table I.

PCR primers and restricted enzymes.

Primers	Sequences
2578F	5′-CTCCACCAAACCACAGCAAC-3′
2578R	5′-GGCTACTTCTCCAGGCTCAC-3′
936F	5′-ACCACACCATCACCATCG-3′
936R	5′-CCAACTCAAGTCCACAGC-3′